Rear air guide ring for pipeline fan

Abstract

A rear air guide ring for a pipeline fan comprises an inner ring and an outer ring, and the inner ring and the outer ring are connected through a plurality of rear wings. The rear wings are distributed in an annular array mode, and the section of each rear wing is of an arc-bent sheet-shaped structure. Further, the windward side of the rear wing is in an arc protrusion shape with the middle high and the two sides extending towards the side face of the rear wing in an arc mode. The rear wing structure has the advantages that the rear wings distributed in the annular array mode are arranged between the inner ring and the outer ring, the structure can effectively guide the airflow direction, airflow mainly flows in parallel in the axial direction, impact of radial wind on the pipe wall and energy loss are reduced, and therefore the overall efficiency of the fan is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation equipment, in particular to a rear air guide ring for a duct fan. Background Art

[0002] In the design of existing duct fans, the tail of the fan is usually round tubular, and the air is directly discharged from the air outlet after being pressurized by the fan. However, the air flow generated by the rotation of the fan blades does not flow purely along the axial direction, but has a certain angle, which results in the movement of the air being decomposed into an axial component and a radial component.

[0003] 1. Among them, the axial air refers to the parallel movement of the air along the axis direction of the air duct. This air flow pattern is what we need because it can make the most of the energy of the fan, efficiently discharge the air from the air duct, and thus improve the overall performance and efficiency of the fan.

[0004] 2. Among them, the radial air refers to the movement component perpendicular to the axis direction generated by the air being affected by the fan blades in the fan. The radial air hits the inner wall of the air duct, generating relatively large friction and turbulence, resulting in energy loss and a decrease in the efficiency of the fan. The resistance of the inner wall not only consumes part of the air kinetic energy but also may cause additional noise and vibration, further affecting the working effect of the fan.

[0005] Therefore, the design of existing duct fans has significant defects in optimizing the air flow direction, that is, it fails to effectively guide the air flow to move along the axis direction as much as possible. Therefore, it is necessary to make further improvements to it. Content of the Utility Model

[0006] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a rear air guide ring for a duct fan with a simple structure, convenient use, which can effectively convert the radial air output by the fan into axial air through the structural design, thereby improving the overall efficiency of the fan, reducing energy loss and noise, and enhancing the stability of the fan operation.

[0007] The purpose of the utility model is realized in the following way: A rear air guide ring for a duct fan includes an inner ring and an outer ring, and the inner ring and the outer ring are connected by a plurality of rear wings; a plurality of the rear wings are provided and distributed in an annular array, and the cross-section of the rear wing is a sheet-like structure with an arc bend.

[0008] Furthermore: The windward surface of the rear wing is provided with an arc convex shape that is high in the middle and extends from both sides to the arc of the side surface of the rear wing.

[0009] Furthermore: The leeward surface of the rear wing is provided with an acute angle shape that inclines towards the center of the air guide ring.

[0010] Furthermore, the windward side of the rear wing is arranged to protrude from the inner end face of the outer ring, so that it extends into the duct of the duct fan.

[0011] Furthermore, the leeward side of the rear wing is arranged to be concave with respect to the outer end face of the outer ring, and the highest point of its leeward side is flush with the outer end face of the inner ring.

[0012] Furthermore, the windward side of the rear wing is provided with a concave arc section, and the inner end of the arc section is smoothly connected to the inner end face of the inner ring.

[0013] Furthermore, the outer ring, the inner ring and the rear wing are integrally injection-molded from a plastic material.

[0014] The beneficial effects of the present utility model are as follows: 1. The structure is simple, the production cost is low, and the market competitiveness is improved.

[0015] 2. By arranging a plurality of rear wings distributed in an annular array between the inner ring and the outer ring, this structure can effectively guide the airflow direction, making the airflow mainly flow parallel along the axial direction, reducing the impact of the radial wind on the pipe wall and the energy loss, thereby significantly improving the overall efficiency of the fan.

[0016] 3. The design of the rear wing greatly reduces the component of the radial wind, avoiding the friction and turbulence of the air flow on the pipe wall, and reducing the ineffective consumption of kinetic energy. This not only improves the energy utilization rate of the fan, but also increases the output air volume and the stability of the air pressure of the fan.

[0017] 4. Due to the reduction of the radial wind, the impact and friction of the air flow on the pipe wall are weakened, and the noise and vibration generated during the operation of the fan are also correspondingly reduced. This makes the duct fan of the present utility model quieter and more stable, and is suitable for environments with high requirements for noise and vibration.

[0018] 5. In the present utility model, the cross-section of the rear wing is designed as a sheet structure with an arc bend, the windward side is high in the middle and convex with arcs on both sides, and the leeward side is inclined towards the center of the air guide ring at an acute angle. These structural designs further optimize the guiding effect of the air flow, making the air flow smoother and more concentrated, and reducing the turbulence and flow resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an effect diagram of the fan assembled and used with the structure of the present utility model.

[0020] Figure 2 It is an exploded view of the structure of the present utility model and the fan.

[0021] Figure 3 、 4 It is a schematic diagram of the structure of the present utility model.

[0022] Figure 5 It is a cross-sectional view of the rear wing structure in the present utility model. Detailed implementation manners

[0023] The following further specifically describes the present utility model in conjunction with the accompanying drawings. A rear air guide ring for a duct fan includes an inner ring 1 and an outer ring 2, and a plurality of rear wings 3 are connected between the inner ring 1 and the outer ring 2; a plurality of the rear wings 3 are provided and are distributed in a circular array, and the cross section of the rear wing 3 is a sheet structure with an arc bend.

[0024] In one embodiment: the windward surface 31 of the rear wing 3 is set in an arc convex shape with a middle height and both sides extending backward to the arc of the side surface of the rear wing 3.

[0025] In one embodiment: the leeward surface 32 of the rear wing 3 is set in an acute angle shape inclined towards the center of the air guide ring.

[0026] In one embodiment: the windward surface 31 of the rear wing 3 protrudes from the inner end surface of the outer ring 2 so that it extends into the conduit of the duct fan.

[0027] In one embodiment: the leeward surface 32 of the rear wing 3 is concave with respect to the outer end surface of the outer ring 2, and the highest point of its leeward surface 32 is flush with the outer end surface of the inner ring 1.

[0028] In one embodiment: the windward surface 31 of the rear wing 3 is provided with an inwardly concave arc section 33, and the inner end of the arc section 33 is smoothly connected to the inner end surface of the inner ring 1.

[0029] In one embodiment: the outer ring 2, the inner ring 1 and the rear wing 3 are integrally injection-molded from a plastic material.

[0030] Working principle: The rear air guide ring for a duct fan of the present utility model is composed of an inner ring 1, an outer ring 2 and a plurality of rear wings 3. The inner ring and the outer ring are connected by a plurality of rear wings, and the rear wings are distributed in a circular array, and its cross section is a sheet structure with an arc bend. When this air guide ring is assembled with the fan, it can be clamped on the inner hole of the air duct 5 by using its outer ring bracket, so that the outer ring and the air duct are coaxially assembled.

[0031] When the fan operates, the wind generated by the rotation of the fan blade has two components, an axial component and a radial component. In a traditional duct fan, the radial wind will hit the pipe wall, resulting in energy loss. However, in the present utility model, through the special design of the rear wing, since the air fluid is viscous, when flowing through the rear wing with an arc cross section, the rear wing will change the flow direction of the fluid. The duct fan equipped with this rear air guide ring obtains wind parallel to the axis, makes the wind blow farther, enables it to have a larger air volume and air pressure, utilizes the angle of attack principle of aerodynamics, with a reasonable radian, makes the wind passing through the rear air guide ring as balanced with the axis as possible, reduces the radial wind, increases the axial wind, and guides the air flow so that it mainly flows along the axial direction.

[0032] In addition, the windward surface 31 of the rear wing 3 is designed with a higher middle part and arc-shaped protrusions on both sides. This structure enables the windward surface to distribute the oncoming airflow to both sides, reducing the airflow turbulence and making it flow more smoothly along the axial direction. At the same time, the leeward surface 32 of the rear wing 3 is inclined towards the center of the air guide ring and is set at an acute angle. Such a design enables the leeward surface to further guide the airflow direction, reducing the generation of eddy currents and turbulence and making the airflow more concentrated and smooth.

[0033] After the fan starts, the fan blades rotate to generate airflow. At this time, the airflow has two components: axial and radial. When the airflow enters the area of the rear air guide ring, due to the windward surface design of the rear wing, the oncoming airflow is guided to both sides, reducing the turbulence. At the same time, the inclined structure of the leeward surface further guides the airflow direction, making the airflow mainly flow parallel along the axial direction. Among them, since the windward surface of the rear wing extends into the conduit, the airflow has been preliminarily guided before entering the fan conduit, and the component of the radial wind is significantly reduced. Finally, the airflow flows parallel along the axial direction, reducing the impact of the radial wind on the pipe wall and significantly improving the efficiency of the fan. The entire system operates more stably, and the noise and vibration are also effectively controlled.

[0034] Through the above working principle, the rear air guide ring for the duct fan of the present utility model effectively solves various problems in the prior art, achieves an efficient and low-noise airflow guiding effect, provides reliable technical support for improving the performance of the fan, and thus can be widely promoted and used.

[0035] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the claims of the present inventive creation.

Claims

1. A rear air guide ring for a duct fan, characterized in that: It comprises an inner ring (1) and an outer ring (2), wherein the inner ring (1) and the outer ring (2) are connected via a plurality of rear wings (3); the rear wings (3) are provided with a plurality of sheets distributed in a ring array, and the cross section of the rear wings (3) is a sheet-like structure with an arc curve.

2. The rear air guide ring for a duct fan according to claim 1, characterized in that: The windward surface (31) of the rear wing (3) is high in the middle and is arranged in the shape of an arc protrusion with two sides extending in an arc toward the side of the rear wing (3).

3. A rear air guide ring for a duct fan according to claim 1 or 2, characterized in that: The leeward surface (32) of the rear wing (3) is arranged in an acute angle shape inclined in the direction of the center of the wind guide ring.

4. A rear air guide ring for a duct fan according to claim 1 or 2, characterized in that: The windward surface (31) of the rear wing (3) protrudes from the inner end surface of the outer ring (2) so as to extend into the duct of the duct fan.

5. A rear air guide ring for a duct fan according to claim 1 or 2, characterized in that: The leeward surface (32) of the rear wing (3) is arranged concavely on the outer end surface of the outer ring (2), and the highest point of the leeward surface (32) is arranged flush with the outer end surface of the inner ring (1).

6. A rear air guide ring for a duct fan according to claim 1 or 2, characterized in that: The windward surface (31) of the rear wing (3) is provided with a concave arc section (33), and the inner end of the arc section (33) is smoothly connected to the inner end surface of the inner ring (1).

7. The rear air guide ring for a duct fan according to claim 1, characterized in that: The outer ring (2), the inner ring (1) and the rear wing (3) are integrally injection-molded from a plastic material.

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